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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Funny repeat problem with a 60 inch RCA PTK195AC (model P60812BL)
This is a continuing saga of a 60 inch rear projection RCA TV. It has
a chassis number of PTK195AC and is model P60812BL. I have now had a repair technician over and it worked like a charm while he was here and for a couple of hours after he left. Then it returned to the absolutely black picture it had when the problem first surfaced a few days ago. The repair technician feels he should change the EPROM. Can an EPROM problem result in NO output from a projection tube? This is the sequence of events. The other day one minute it was working perfectly (as it has for 8 years). All of a sudden I walked into the room and the screen is black (none of the projection tubes are putting out any light). Turning it off, using the DVD and many other attempts to get a picture failed. I let it stay off for a while, then turned it on. It would have a picture for a short time that looked like an old 60's horizontal hold problem with a partial, shrunken picture. After a while the picture would be stable enough to be able to read letters, but totally distorted. I was afraid to leave it on long figuring I might stress the conditon. I called a repair technician and he came over today. The repair technician went into the service mode of the TV and changed a number of parameters stored in the EPROM and finally got it looking as good a new. He also used an external alignment generator and the grid looked straight and proper. Colors were true and bright. As I said, this lasted about a couple of hours after he left and then the screen went black (non of the projection tubes are generating any output) which is exactly the condition that happened when the problem first started. The filaments in the projection tubes glow and the sound and power-on sequence is just as it should be. So far I have not been able to get any type of picture back. I tried to get into a service mode per the instructions to push the menu power and +vol button. I have no picture and that did not give me one to be able to see any setup procedure. Again, would a bad EPROM result in NO output from the projection tubes? Anyone have any ideas where to start? |
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